Probably because people expect something that's manufactured to be market ready unless it's explicitly stated that they know they're receiving a beta product and they're getting a discounted price to cover manufacturing cost and help fund changes. Even though it was stated that the first set could have some slight errors, it was also stated that there would be strict QC. Perhaps some people felt that the legend issues were more than slight errors or that the QC was not strict or that the legends on the Ctrl cap in the picture were not indicative of the legends on the final set they received. I can't say why people feel the way they do, but that seems to be the main issue at play from what I've seen people say.
That said, I haven't seen people saying to not support JTK though, just that there's room for improvement and that they'd take other manufacturers over JTK for now. I think, perhaps, that the CtrlAlt team is misconstruing this because of their relationship with JTK. What I see is people saying that they like the potential of a product, but that they won't recommend it as the go to product yet due to its flaws; however, once those issues are worked out, it should be a great alternative that's cheaper than GMK with similar quality.
I can say with me that I felt that the set and how it would look was oversold and that what I got was a little disappointing as a result. That does not mean that I won't support JTK in the future should there be a set I like, but that until the legend issues get worked out or prices run closer to the $60 mark the original set ran at, I'd rather spend a little more and get GMK.
On the artisan comparison, I think people expect artisans to be a little rough when they start out, so it's okay. I do think that the pricing of a lot of upstart artisans is obscene though and I really don't understand how people can pay $30+shipping or more for unproven or rough artisan caps. That's just as much of a mystery to me.
